Probability Unit Test Answers
1. A bag contains 5 red marbles, 3 green marbles, and 2 blue marbles. What is the probability of selecting a red marble from the bag?
Answer: The probability of selecting a red marble is 5/10 or 1/2.
2. A standard deck of playing cards contains 52 cards. What is the probability of selecting a red card from the deck?
Answer: There are 26 red cards in a standard deck, so the probability of selecting a red card is 26/52 or 1/2.
3. If a spinner is equally divided into 8 sections and each section is labeled with a different number from 1 to 8, what is the probability of landing on an odd number?
Answer: There are 4 odd numbers (1, 3, 5, 7) out of the 8 total numbers, so the probability of landing on an odd number is 4/8 or 1/2.
4. A dice is rolled. What is the probability of rolling an even number?
Answer: There are 3 even numbers (2, 4, 6) out of the 6 possible outcomes when rolling a dice, so the probability of rolling an even number is 3/6 or 1/2.
5. A bag contains 4 red balls, 3 blue balls, and 2 green balls. What is the probability of selecting a blue ball from the bag?
Answer: The probability of selecting a blue ball is 3/9 or 1/3.
6. A jar contains 10 red marbles and 5 blue marbles. What is the probability of selecting a red marble from the jar?
Answer: The probability of selecting a red marble is 10/15 or 2/3.
7. A box contains 6 white balls, 4 black balls, and 2 yellow balls. What is the probability of selecting a black ball from the box?
Answer: The probability of selecting a black ball is 4/12 or 1/3.
8. If you flip a coin, what is the probability of it landing on heads?
Answer: The probability of flipping heads on a coin is 1/2.
9. A bag contains 8 blue marbles, 4 green marbles, and 3 white marbles. What is the probability of selecting a green marble from the bag?
Answer: The probability of selecting a green marble is 4/15.
10. If a card is randomly selected from a standard deck of playing cards, what is the probability of selecting a heart?
Answer: There are 13 hearts in a standard deck of 52 cards, so the probability of selecting a heart is 13/52 or 1/4.